Perhaps you should try some spelling variations:
danh viet » anh viet, ninh viet, nang viet
doc sach » hoc sach, toc sach, nuoc sach
thuc day » thuc dan, thuc vat
viet cua » viec cua, viet ca, viet qua
nang xa » nang x, lang xa, nang ma
va nham » va cham, va tham, va nha
thuc va » thuc vat, thuc dan
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach y nang xa hoi. lieu va nham ((thuc va) OR (thuc day)) danh viet cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach y nang xa hoi. lieu va nham ((thuc va) OR (thuc day)) danh viet cua tre".
• Adding a wildcard symbol may retrieve word variants: doc sach y nang xa hoi. lieu va nham ((thuc va) OR (thuc day)) danh viet cua tre*.